Help your students prepare for their Maths GCSE with this free difference of two squares worksheet of 33 questions and answers
When a binomial quadratic expression involves a square term subtracting another square term we can factorise it by using the difference of two squares method. This involves two perfect squares being subtracted from each other.
In order to use the difference of two square method, the square roots of both terms need to be found. These terms are then placed into a pair of double brackets with a plus sign in one and a minus sign in the other. This results in the algebraic expression being written as a product of two factors. Knowledge of square numbers, square roots and indices is useful when using this method.
Sometimes, before the difference of two squares method can be used, the expression will need to be factorised into a single bracket by finding a common factor of each of the coefficients and/or constants in the expression.
Factorising using the difference of two squares can be useful when solving quadratic equations or when simplifying algebraic fractions.
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